Improving the staggered quark action to reduce flavour symmetry violations

Details Improving the staggered quark action to reduce flavour symmetry violations Improving the staggered quark action to reduce flavour symmetry violations

1997-09-12

arxiv.org/abs/hep-lat/9709035v1

Nucl.Phys.Proc.Suppl. 63 (1998) 892-894

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, Latex using espcrc2.sty. 1 coloured postscript figure included with epsffile. Talk presented by D.K.Sinclair at LATTI

Scientific paper

10.1016/S0920-5632(97)00932-8

We investigate a class of actions for lattice QCD with staggered quarks aimed at reducing the flavour symmetry violations associated with using staggered fermions. These actions replace the gauge field link fields in the quark action with covariantly smeared fields. As such they are an extension of actions considered by the MILC collaboration. We show that such actions systematically reduce flavour symmetry violations in the weak coupling limit. Using the mass splitting between Goldstone and non-Goldstone pions as a measure of flavour symmetry violations we find that these actions have considerably less flavour symmetry violations than the standard staggered action, and represent an improvement on what can be achieved with the MILC action, on quenched configurations with $\beta=5.7$.

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